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<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>首页</title>
</head>

<body>
    <h1>希望服务器推送给消息给我</h1>
    <script>
        var ws = new WebSocket('ws://localhost:8080');

        // onopen是一个事件 open 连接
        ws.onopen = function () {
            console.log('ws onopen');
            ws.send('form client:hello');
        }
        ws.onmessage = function (e) {
            console.log('ws onmessage');
            console.log('form server: ' + e.data);
        }
    </script>
</body>

</html>